Railway signaling



Jan. 7, 1930. STOKER I 1,742,734

RAILWAY S IGNALING Filed Sept. 22, 1928 INVENTOR. 1 7 R s: o k e. I,

M a ATTORNEY Patented Jan. 7, 193% UNITED STATES PATENT PAUL I. STOKER, 0F WILKINSBURG, PE SWITCH & SIGNAL COMPANY, OF SWISS PENNSYLVANIA OFFICE I NNS YLVANIA, ASSIGNOR TO THE UNION VALE, PENNSYLVANIA, A CORPORATION OF RAILWAY SIGNALING Application fiIed September 22, 1928. Serial No. 307,644.

sion, in systems of this character, ofnovel' and improved means for the control of what are known as calling-on signals. 1

I will describe one form of signaling system embodying my invention, and will then point out the novel features thereof in claims.

The accompanying drawing is a diagrammatic view showing one form of signaling system embodying my invention.

Referring to the drawing, the reference characters 1 and 1 designate the track rails of a stretch of railway track M over which traffic moves in both directions. These rails are divided by insulated joints 38-to form a track section A D, and the section A-D contains a switch Swhich leads from the main trackM to a passing siding C. I

Section A-D is provided with a track circuit, comprising a battery 2 connected across the rails at one end of the section, and a track relay T connected across the rails at the other end of the section. The track rails of both the main track M and the passing siding C are included in this track circuit in the usual and well known manner. 7

Eastbound trafiic through the section A-D is governed by a signal S having a main arm 3, an auxiliary arm 3*, and a callingon arm 3. Westbound traflic through the section is governed by a signal S having a main arm 3 an auxiliary arm 3", and a calling-on arm 3. In accordance with usual practice, the main arm 3 and the calling-on arm 3 of signal S are located adjacent the main track M, and the auxiliary arm 3 is located adjacent the siding C. When either arm 3 is in the clear position it indicates that switch S isin its normal position and. that high speed traflicover this switch is permissible. When either arm 3 is in the clear position, it indicates that switchS is in the reverse position and that low speed traffic over this switch is permissible. When either calling-onarm 3 is in the clear posisource of current.

tion, it indicates that cupied but that a closing-in movement is'permissible.

The reference character K designates a switch indication relay which is controlled by a pole-changer 4 operatively connected with the switch S. When the switch is in the normal position, relay K is energized in the normal direction, whereaswhen the switch is in the reverse position this relay is energized in the reverse direction. The circuit for relay K will be obvious from the drawing.

The signals are controlled by three stick relays F F and I and these relays are in turn controlledby three selectors X X and X. These selectors are controlledfrom a remote point such as a despatchers oflice. Each selector comprises a normally open contact 6 which momentarily becomes closed when the selector receives the code impulse combination to which it is designed to respond. A fourth selector X is provided for a purpose which will appear hereinafter.

Each arm of each signal is provided with a 1 cont-r01 relay designated by the reference character H with a suitable exponent and a suitable subscript. .F or example, the main arm 3 of signal S isprovided with a control or home relay H and the signal arm is controlled by a contact 32 of this relay through a circuit which will be obvious from the drawing. I v V I will assume that switch S is in the normal position, and that the despatcher desires to permit an eastbound train to pass through the section AD. To do this, he operates selector X When contact 6 of thisselector becomes closed, it closes Va'pick-up, circuit for relay F which circuit is from terminal B of a suitable source of current, through wire 5, contact 6 of selector X wire 7 ,fandthe wind-e ing of relay F to terminal 0 of the same As soon as relay F becomesclosed, a stick circuitffor this relay is closed, which circuit passes from terminal B, through resistance 8, back contact 9 of relay F front contact 10, of relay F and the winding of relay F to terminal 0. It follows that relay F will remain closed if and onlyif relay]??? is (ls-energized. If the track section section A D is oc- AD is unoccupied, so that track relay T is energized, home relay H will become closed, its circuit being from terminal B, through contact 17 of track relay T, front contact 18 of relayoF front contact 19 of indicationrfelay K, polar contact 20, ofrelay K in the normal position, and winding of relay H to terminal 0. It will be noted that this circuit cannot be closedif the track section A-D is occupied. Vhen relay H becomes closed, it will close at contact 32 the circuit for the main arm 3 of signal S As soon as the eastbound train enters section AD it will open track relay T, thereby de-energizing relay 11%, with the result that signal arm 3 will return to thestop position. Relay F will, however. remain energized. i;

If switch S be in the reverse position when selector X is operated,,relay-H willbecome. energized, its. circuit being, from ter- Ininal B, through contact 17 of track relay contact 18 ofrelay F contact 19 of relay K, contact 20 of relay K in the reverse position, and the winding of relay H5 to terminal O. The circuit for the auxiliary arm 3 of signal S will then be closed atcontact 33 of relay H so that this arm will move to the clear position. 7 I

I will now assume that the despatcher (lee siresto permit a westbound train to pass through'section AD. To do this, heoperatesselector X thereby closing the pickup circuit for relay FW; this circuit is from terminal B, through wire 5, Contact 6 of selector X wire 11, and the winding of relay 1?? to terminal O. As soon as relay F becomes energized, a stick circuit for this relay is closed, which circuit passes from terminalB through resistance 8, back contact 12 of relay 1 F front contact 13 of relay F and the winding of relay F to terminal 0. If switch S be in the normal position relay H will become energized, its circuitbeingfrom terminal B through contact 21 of, trackrelay T, contact 22 of relay F neutral contact 23 of relay K, polar contact 24 of relay K inthe normal position, and the winding of relay H toterminal O. The circuit for arm 3 oisignal S will then become closedcat contact 35 ofrelay H g If switch S be in the reverse position, relay Hfe will become ener;

gized because contact 24 of relay K will be in the reverse position H v .I will now assume that section AD is occupied by an eastbound train, that relay FF is still energized, and that the despatcher de;

sires to permit a second eastbound train to enter this'sectiona To do this, he operates selector X9, therebyclo singthe pickmp circuit for relay F.,,wl iich.c1r cuit isfrom ter minal' B through wire5, ,contact 6 of. selector X9, wire 14 and the windingof relay ,to terminal Relay. ,FF then remains ener:

e' aed brrirtii Q a iskic e it whi p ss from terminal B, through resistance 8, front contact 15 of relay F, and the winding of this relay to terminal 0. Relay F being also energized, relay H will become energized, its circuit being from terminal B, through contact, 25 of relay F contact 26 of relayFF, bacl ;contactz27,of relayv HA back contact 28 of relay H and the winding of relay H 5 to terminal It will be noted that this circuit cannot be closed unlessboth relays and H are ole-energized. The; circuit for the calling-on arm 3 of signal S will now be closed at contact 34 of relay H section be occupied by a westbound train and the despatcher desires to permit a second westbound train to enter the section, he will actuateselectorXF, as before, to energize relay F, with the result that this relay and relay F will both-be energized. Relay. H will thenbecome energized by virtueofa circuit which passes frointerminal B, through contact 25 of relay F, contact 29 of relay F back contact 30 oi relay H back contact 31 of relay H and the winding of relay H k to terminal 0. The circuitior calling-on arm 3 of signal SW gillthen become closed at contact 37 of relay 0 VVhen selector X is operated to closeits contact 6, this contact will momentarilyclose a shunt around the windings of stick relays FF, F, and FF, so .that whatever one or whatever two of these relays are then energized will become tie-energized. j

Although I have herein shownand. described only one form of signaling system embodying my invention, it is understood that various changes and modifications may be madetherein within the scope of the ap pended claims withoutdeparting from the spirit and scope of my invention.

tion, an eastbound calling-on signal and a.

westboundcalling-on signalfor said, section, an eastbound stick relayand, a west bound stick relay, an eastbound home relay for saideastbound main signal, a westbound home relay for said westbound main signal,

a li sro Stick seamen as ou d ll n r r lay fer' ei eae eu dc linsr nc l; a w-es eu re lli -Qw r y o sa d wes bound calling-on signal, a pickup circuit for said eastbound stick relay including a ne ma lr-epe gflonme nt o ed tram a re mote point, apick up cir cuit for said west;

hbllnd;stick relaylincluding a normally open contact controlled jirorn said remote ,point,

a Stick circuit tor each'ot-said eastbound andwestbound stick ,relays each including. a back we te il e t en relay, i itf-Q Sa d eastbound home relay including a front contact of said eastbound stick relay and a front contact of said track relay, a circuit for said Westbound home relay including a front contact of said westbound stick relay and a front contact of said track relay, a pick-up circuit for said calling-on stick relay including a normally open contact controlled from said remote point, a stick circuit for said callingon stick relay, a circuit for said eastbound calling-011 relay including a front contact of said calling-on stick relay as well as a front contact of said eastbound stick relay and a back contact of said east-bound home relay, a circuit for said westbound relay including a front contact of said calling-on stick relay as Well as a front contact of said westbound stick relay and a back contact of said westbound home relay, and means controlled from said remote noint for de-energizing all of said stick relays.

2. In combination, a section of railway track, a track circuit including a track relay for said section, an eastbound main signal and a westbound main signal for said section, an eastbound calling-on signal and a westbound calling-on signal for said section, an eastbound stick relay and a west-, bound stick relay, an eastbound home relay for said eastbound main signal, a westbound home relay for said westbound main signal, a calling-on stick relay, an eastbound callingon relay for said eastbound calling-on signal, a westbound calling-on relay for said west-- bound calling-on signal, means including .selectors for energizing said stick relays, means for energizing the eastbound or the westbound home relay provided the associated stick relay and said track relay are energized, and means operating when said calling-on stick relay is energized to energize the eastbound or the westbound calling-on relay according as the eastbound or the westbound stick relay is energized and provided the associated home relay is ole-energized.

3. In combination, a section of railway track, a track circuit including a track relay for said section, an eastbound main signal and a westbound main signal for said section,

. an eastbound calling-on signal and a Westbound calling-on signal for said section, an eastbound relay, a westbound relay, and a calling-on relay, means including selectors for energizing said relays, means for clearing said eastbound or said westbound main signal according as said eastbound or said westbound relay is energized provided said track relay is also energized, and means operating when said calling-on relay is energized to clear either the eastbound or the westbound calling-on signal according as the eastbound or the westbound relay is energized and provided said track relay is de energized.

4. In combination, a section of railway track containing a switch, a trackcircuit including a track relay for said section, a main signal and an auxiliary signal as well as a calling-on signal governing eastbound traflic through said switch, a main signal and an auxiliary signal as well as a calling-on signal governing westbound traflic through said switch, an eastbound relay, a westbound relay and a calling-on relay, means including selectors for energizing said relays, means operating when said eastbound relay is energized to clear the main or the auxiliary eastbound signal according as said switch is in the normal or the reverse position and provided said track relay is energized, means operating when said Westbound relay is energized to clear the main or the auxiliary westbound signal according as said switch is in the normal or the reverse position and provided said track relay is energized, and means operating when said calling-on relay is energized toclear said eastbound or'said west bound calling-on signal according as said eastbound or said westbound relay is energized and provided said track relay is deenergized.

In testimony whereof I atfix my signature.

PAUL P. STOKER.

law 

